[Isehara City] Renovation of Vacant Houses and Used Properties | Costs, Subsidies, and Case Studies

For those considering renovations of used properties and vacant houses in Isehara City

I bought a used property, but I’m not sure if the renovation estimate I received is reasonable

This is my first full renovation, and I’m worried about making mistakes

I want to make the most of subsidies and grants

For such concerns, Kakeru Koumuten Co., Ltd., which has numerous achievements in Isehara City, will clearly explain the key points for a successful renovation.

Obtain estimates from at least 3 companies!

01Reasons for the Increase in Renovations of Used Properties and Vacant Houses in Isehara City

Isehara City is known as a gateway town to Mount Oyama (Afu Shrine), where nature and convenience are harmoniously balanced, with the Odakyu Line and Tomei Expressway running through it. The rural landscape overlooking Tanzawa and Oyama is well-balanced with residential areas around the station and in the southern part of the city.

Isehara City also has single-family residential areas developed during the Showa era, which have aged over the years. Therefore, there is the option to “buy a used house and renovate it to fit your lifestyle.”

02Reasons for Renovating Vacant Houses and Used Properties

In recent years, the Japanese housing market has expanded options not only for new constructions but also for renovating used properties. There is a growing interest in living in renovated or refurbished used homes. Here, we explain the typical reasons for renovating vacant houses and used properties.

Reason 1 To Live Comfortably as Your Own Home

The most common reason for purchasing and renovating a used property is “to live comfortably.” Older homes often have issues with roofs, exterior walls, and plumbing, making them less livable as they are. By renovating and updating the facilities and interiors, you can create a comfortable living environment. Additionally, by changing the layout and refreshing the interior, you can finish a home that suits your family’s lifestyle while keeping costs lower than new construction.

Reason 2 To Increase Asset Value for Sale

More people are purchasing and renovating used properties with the intention of selling them. Used homes are often evaluated as having low asset value in their current state, but renovations can enhance their appearance and performance, thereby increasing their value as properties.

Reason 3 To Utilize as Investment or Business

When purchasing for investment or business purposes, renovations are essential. By transforming them into stylish rentals or share houses, you can differentiate from other properties, and depending on the location and planning, you can also expect improved profitability. Initial costs can be lower than new constructions, and depending on the use and conditions, there may be opportunities for subsidies and tax incentives, leading to an increase in those utilizing vacant houses for business.

03Points to Consider When Renovating Vacant Houses and Used Properties

Point 1　Choose a Reliable Construction Company

First and foremost, it is essential to select a contractor you can trust to handle your renovation. Since used properties have had previous occupants, the internal structure and condition are often not clear until you actually see them. Choose a contractor who can perform the work thoroughly according to your wishes, the structure of your home, and the surrounding environment, and who also provides aftercare following the construction.

Point 2　Always Check the Deterioration of the Building

For used properties and vacant houses, it is crucial to check which parts have deteriorated and to what extent beforehand. Since the property has been lived in by someone else, internal damage is often not apparent without investigation. Conduct a current condition survey before starting construction to identify any hidden deterioration.

Point 3　Review Earthquake Resistance and Insulation Performance

Particularly important in the renovation of used and vacant houses is the review of earthquake resistance and insulation. The earthquake resistance standards were significantly revised in 1981, and homes built before that may not meet current standards. Furthermore, in 2000, regulations regarding joints and foundations were strengthened, making older buildings more likely to lack earthquake resistance. Check the condition of the building before starting construction and be sure to check the earthquake resistance and insulation.

Point 4　Check Subsidy Programs and Renovation Tax Deductions

To keep construction costs down, it is important to check for subsidies and renovation tax deductions. Subsidies are provided by the national and local governments, supporting a portion of costs for earthquake-resistant renovations, energy-saving construction, and barrier-free modifications. Tax deductions include the “housing loan tax deduction” when using a housing loan, and there are systems where a portion of costs can be deducted for certain works even with personal funds. These can sometimes be used in combination, so it is essential to check in advance and plan to utilize them strategically as a key to successful renovation (for the latest information, see this subsidy section).

04Cost Estimates for Renovating Vacant Houses and Used Properties

The renovation costs for used properties and vacant houses vary significantly based on the extent of damage and the scope of work. First, please understand the approximate cost estimates by area to serve as a guideline for your financial planning (the table below provides general estimates for single-family homes. The interior is based on a room of about 6 tatami mats, and the exterior is based on the indicated scope of work. Actual estimates will be provided after a site survey).

1. Roof and Exterior Walls

2. Interior (Interior Finishing)

3. Water Facilities

4. Equipment and Infrastructure

5. Waterproofing and Earthquake Resistance

6. Exterior Works

*The above are general estimates. Costs may vary depending on the presence of scaffolding, the condition, grade, and area of the building. Waterproofing for rooftops and updates to plumbing and wiring for the entire house may exceed the above estimates depending on area and method. Please confirm the exact costs with a free on-site survey and estimate.

For more details, please check our construction menu and price list!

05[Latest 2026] Subsidies and Grants Available in Isehara City

*The following information is as of September 3, 2026. The details, duration, and budget of the systems change annually, and many will end once the budget limit is reached. Please check with our company or the respective offices for the latest information before applying. Kakeru Koumuten can assist with confirming the systems and providing necessary documents, but the applicant and application method may differ depending on the system.

National Program: Housing Energy Saving 2026 Campaign

The government is implementing multiple subsidy programs targeting energy-saving renovations under the “Housing Energy Saving 2026 Campaign.” Construction for insulation, windows, and water heaters may be eligible for these subsidies.

Isehara City Program

06Customer Feedback

Roof Replacement Work Examples in Isehara City

07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Isehara City

There are many renovation companies that serve Isehara City, and it can be confusing to decide which one to choose. When requesting renovations, be sure to check the following five points.

1. Have extensive experience in renovation work

Many renovation contractors publish their construction achievements on their websites. If a contractor provides detailed explanations of the process with photos, it makes it easier to visualize the outcome after the request, providing peace of mind. If you have concerns, choose a contractor with extensive experience.

Google and review sites can be helpful resources. It is important to check the content of low ratings, the company’s responses, and the timing of the posts. In particular, Google reviews are useful, but do not make your decision based solely on reviews; evaluate them comprehensively along with the company’s track record, estimates, and warranty details.

2. Confirm the presence of warranties and after-sales maintenance

When choosing a contractor, be sure to check for warranties. If repairs are needed within the warranty period, they may be done for free. The duration varies by contractor and paint type, but typically ranges from 1 to 10 years (emergency repairs and partial repairs are often not covered). Some contractors also offer after-sales services separate from warranties, so be sure to check that as well.

Kakeru Koumuten Co., Ltd. provides warranties for exterior renovations and sealing work. We also conduct after-sales maintenance and send out annual reminder DMs to ensure annual inspections are possible.
Click here for more details on Kakeru Koumuten’s warranties and after-sales maintenance

3. Obtain estimates from multiple contractors (at least 3 companies)

When requesting renovations, be sure to obtain estimates from multiple contractors. Even for the same work, warranties, after-sales services, and prices can vary significantly. Having multiple estimates can also make price negotiations easier.

When comparing estimates, it is important to look at not just the costs but also the “items in the estimate,” “check the undercoat materials, sealing materials, and paint for ancillary parts,” and “confirm the process.” Lowering the rank of ancillary parts or skipping processes can reduce costs, so it is crucial to not judge solely based on price.
Click here for detailed points on comparing estimates

4. Confirm whether the contractor performs renovations in-house

Kakeru Koumuten Co., Ltd. conducts detailed hearings and surveys on the existing “condition,” “location,” “materials,” “desired durability,” and “design” to propose the optimal plan. While there is no inherent problem with the system where partner companies perform the construction, it is essential to confirm whether the contracted company understands the construction details and has clearly defined responsibilities for quality control and guarantees. If the construction is done in-house, it becomes easier to coordinate with the site, allowing for quick responses in case of any troubles.

5. Do they offer color simulations and perspective drawings?

Choosing colors and envisioning the post-construction appearance can be challenging for both exterior and interior work. With simulations, you can reduce the risk of mistakes like “it turned out differently than I imagined.” Since it is difficult to redo once the construction is done, it is advisable to choose a company that can accommodate flexible simulations.

08Reasons why Kakeru Koumuten is chosen for remodeling used houses in Isehara City

One reason is that “Kakeru Koumuten also serves Isehara City,” but
“our unique approach to remodeling vacant and used properties that cannot be imitated by other companies”
has received high praise from many customers.

1. Equipment specialized for in-house remodeling

Kakeru Koumuten has organized warehouses and material storage to provide high-quality remodeling at low costs. We have established five bases, including the Machida store in Tokyo, centered around Aoba-ku, Yokohama.

In-house scaffolding materials

For exterior renovations, we can construct temporary scaffolding using our own scaffolding materials and in-house scaffolding team. By not outsourcing, this leads to cost savings on scaffolding work. We own scaffolding materials for approximately 50 single-family homes.

Materials stored in our large in-house warehouse

We store roofing materials and paints. By placing large orders at once, we can procure materials at lower prices, and since we always have stock available, we can respond quickly in emergencies. We are also equipped with various tools that can handle different types of construction, such as compressors and cleaning machines.

In-house waste separation

In exterior renovations, various waste materials such as paint, wood, and metal are generated. While many contractors dispose of them all together, we separate and recycle waste materials, significantly reducing waste disposal costs.

Exterior renovation dedicated showroom

In our showroom, you can not only have meetings but also check the actual paint colors and a wide variety of catalogs. You can also confirm heat insulation properties using a heat insulation paint testing machine and color simulation. The showroom is a 3-minute walk from Eda Station in Aoba-ku, Yokohama.

2. Complete In-House Construction

A major strength of Kakeru Koumuten Co., Ltd. is our complete in-house construction. By maintaining a consistent system from inquiry to project completion, we can keep costs down while providing high-quality renovations. A single representative handles everything from the estimate to project completion, ensuring smooth communication without changes in sales or construction management. All work, from temporary scaffolding setup to exterior painting and roof renovations, is carried out by our own skilled craftsmen. We are confident in our plans and costs, so we welcome competitive estimates.

3. Various Permits and Skilled Workers

We have obtained construction industry licenses and permits for industrial waste collection and transportation. We also have nationally certified sheet metal and painting specialists on staff, ensuring confidence in our construction techniques. We are capable of handling large-scale painting projects for factories and apartment complexes as well.

4. Warranty and Aftercare

Exterior painting and joint sealing work come with a warranty. Aftercare is available every year, and we send out notification DM annually. If you are concerned about the warranty, please click on the image above to check.

5. Flexible and Prompt Response

We are equipped to handle various exterior troubles and situations. Even if you cannot access the roof at high places, we can respond using a drone. We also use a thermal imaging camera for leak investigations. We respond according to our customers’ wishes and also accept emergency measures for sudden leaks from the exterior walls only.

6. Human Resource Development

To improve skills, we create various models and conduct practical training. Since exterior renovations vary in construction methods and materials depending on the existing materials and shapes, we regularly conduct technical improvement training so that each staff member can respond to various sites.
Click here for company information

7. Flexible Simulations for Both Exterior and Interior!

Kakeru Koumuten is dedicated to helping you choose colors and designs for your important building renovations, both exterior and interior, to ensure your satisfaction.

7-1. Exterior Renovation Simulation

We can provide color simulations for exterior wall painting, as well as simulations for metal siding and roof overlays. We can create simulations from actual photos of your building and suggest several patterns with our recommended color combinations. We also accommodate “test painting” and “sample board arrangements” to confirm the actual color tones.

7-2. Interior Renovation Simulation

We also support simulations and perspective drawings for interior renovations. Based on your preferred image, such as a modern style, we will propose recommended simulations. We create realistic perspectives from actual floor plans.

8. We also handle solar panel and storage battery installation work!

More customers are introducing solar equipment with generous subsidies for renovations of used properties. Kakeru Koumuten Co., Ltd. also handles solar equipment installation and will propose solar panels tailored to the shape of your roof. We can also accept requests for estimates and power generation simulations only.

09Renovation of Used Properties and Vacant Houses in Isehara City | Frequently Asked Questions

We will answer the most frequently asked questions from those considering renovations of used properties and vacant houses in Isehara City.

View Kakeru Koumuten’s project examples
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10Features of Isehara City

Isehara City is known as the gateway town to Mount Oyama (Afuri Shrine) and is a place where nature and convenience are harmonized, with the Odakyu Line and Tomei Expressway passing through. The rural landscape overlooking Tanzawa and Oyama is well-balanced with residential areas around the station and in the southern part of the city.

Isehara City also has older single-family residential areas, making it important to check the condition of buildings when purchasing used homes. Kakeru Koumuten is headquartered in Aoba-ku, Yokohama, and offers a wide range of exterior and interior renovations in Isehara City. We can perform in-house construction even for roof overlay methods.

Areas We Serve for Renovations

Kakeru Koumuten accepts requests from a wide range of areas in Kanagawa and Tokyo. Since the response may vary depending on the type of work and region, please contact us in advance.

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